Cloud CX335 Specifications download pdf (Page 10)

CX335 Technical Manual Page 9

COMPRESSORS and LIMITERS

4.01 What is a compressor / limiter?

Compression is an audio process that reduces the output progressively once the input

level has risen above a pre-settable threshold. Once this threshold level is exceeded then

the rate at which the output is reduced is controlled by a predictable rate, called 'ratio'.

Limiting is an extension of compression where once the threshold is exceeded, the output

level will not rise any further. Therefore limiting can also be perceived as a compressor

with its 'ratio' set higher than 20 to 1.

4.02 Threshold explained

As a rotary control, the threshold parameter is easy to understand. Threshold compares

the input level to the level set on the front panel. It is very common to see the graticule

around the threshold control marked from higher levels on the counter clockwise end to

lower input levels on the clockwise end. This is because more compression happens as

the control is turned 'up'.

4.03 What is Hard-knee and Soft-knee?

The actual threshold point where compression takes place is called the 'knee', the reason

being that if a graphical representation of input level verses output level is made, then

below threshold the line will be at 45° (output is the same as input). Above threshold this

line will have a gentler slope equal to the ratio setting. So the line will have a definite 'fold'

or 'knee'. (see following diagram).

With high ratio settings this knee can be very noticeable. To prevent this sudden change

between no compression below threshold and lots of compression above threshold, it is

much gentler on the ear if this knee is 'rounded' or softened. Soft-knee is more musical

and desirable if the actual compression process is not to be too obtrusive. So by default,

the CX335 compressor limiter is a 'soft-knee' device, yet still can be overridden by use of

the Hard switch.

TRANSFORMER

FIT ONE

LINK FOR

220/240

VOLTS

OPERATION

FIT TWO

LINKS FOR

110/120

VOLTS

OPERATION

240V

TRANSFORMER

120V

VIEW INSIDE CX335 SHOWING POSITION OF VOLTAGE SELECTION LINKS

HIGH VOLTAGE

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 21 22

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Cloud CX335 Specifications Page 10

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